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The pnictide superconductor SrPtAs has a hexagonal layered structurecontaining inversion symmetry. It is formed by stacking two inequivalent PtAslayers separated by Sr layers. The former have no local (in-plane) inversionsymmetry and therefore a (layer-) staggered Rashba spin orbit coupling appearswhich splits the three Kramers degenerate bands into six quasi-2D bands. Thesymmetry of the superconducting state of SrPtAs is unknown. Three candidates,spin-singlet $A_{1g}$ and $E_g$ as well as triplet $A_{2u}$ states have beenproposed. We predict the quasiparticle interference (QPI) spectrum for thesegap functions in t-matrix Born approximation. We show that distinct differencesin the pattern of characteristic QPI wave vectors appear. These results may beimportant to determine the gap symmetry of SrPtAs by STM-QPI method.

Gap function of hexagonal pnictide superconductor SrPtAs from quasiparticle interference spectrum